25 lines
745 B
MySQL
25 lines
745 B
MySQL
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-- https://stackoverflow.com/a/61062917
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CREATE FUNCTION uuid_v4()
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RETURNS CHAR(36)
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BEGIN
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-- 1th and 2nd block are made of 6 random bytes
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SET @h1 = HEX(RANDOM_BYTES(4));
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SET @h2 = HEX(RANDOM_BYTES(2));
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-- 3th block will start with a 4 indicating the version, remaining is random
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SET @h3 = SUBSTR(HEX(RANDOM_BYTES(2)), 2, 3);
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-- 4th block first nibble can only be 8, 9 A or B, remaining is random
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SET @h4 = CONCAT(HEX(FLOOR(ASCII(RANDOM_BYTES(1)) / 64)+8),
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SUBSTR(HEX(RANDOM_BYTES(2)), 2, 3));
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-- 5th block is made of 6 random bytes
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SET @h5 = HEX(RANDOM_BYTES(6));
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-- Build the complete UUID
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RETURN LOWER(CONCAT(
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@h1, '-', @h2, '-4', @h3, '-', @h4, '-', @h5
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));
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END
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